Spartina patens

Foote, A. L., and Reynolds, K.A. (1997) Salt meadow cordgrass (Spartina patens) decomposition and its importance in Louisiana coastal marshes. Estuaries 20, 579-588. 

Bergholz, P. W., Bagwell, C. E., and Lovell, C. R. (2001). Physiological diversity of rhizoplane diazotrophs of the saltmeadow cordgrass, Spartina patens Implications for host specific ecotypes. Microb. Ecol. 42, 466—473. 

Burdick, D., Mendelssohn, I., and McKee, K. (1989). Live standing crop and metabohsm of the marsh grass Spartina patens as related to edaphic factors in a brackish, mixed marsh community in Louisiana. Estuaries 12, 195—204. 

Morris,. T. (1984). Effects of oxygen and salinity on ammonium uptake by Spartina alternijlora Loisel. and Spartina patens (Aiton) Muhl.J. Exp. Mar. Biol. Ecol. 78, 87-98. 

In controlled laboratory mesocosms, Spartina patens, a dominant brackish marsh species found along the U.S. Gulf coast, and rice (0. sativd) showed a decrease in net photosynthesis in response to reduced soil redox potentials. Net photosynthesis decreased when soil redox potential or Eh was below -100 mV (Kludze and DeLaune, 1995b). A similar reduction in photosynthetic rates was observed in 0. sativa with increase in intensity of reduction (Figure 7.31). However, wetland plants... 

FIGURE 7.32 Root elongation of Spartina patens in response to changing soil redox potential (Eh), (a) Response to high Eh (aerobic) followed by low Eh (anaerobic) conditions, (b) Reverse procedure. (Modified from Pezeshki and DeLaune, 1990.)... 

FIGURE 7.33 Recovery of root elongation in Spartina patens after an increase in soil redox potential (Eh) to +500 mV. The increase in Eh followed anaerobic conditions in which soil Eh was reduced for 5 days to a range of -180 to -200 mV (closed circles), -100 to 150 mV (x s), and 0 to -100 mV (open circles). (Erom Pezeshki and DeLaune, 1990.)... 

FIGURE 7.35 Root porosity and radial oxygen loss in Spartina patens gvov/n under various soil redox intensity for 50 days. (Modified from Kludze and DeLaune, 1994.)... 

FIGURE 7.38 Radial oxygen loss (ROL) in Spartina patens grown nnder various soil reduction capacities while the reduction intensity was maintained at -200 mV. Values followed by the same letter are not significantly different at the 0.05 level. (From Kludze and DeLaune, 1995b.)... 

High rate of DMS emissions from S. alterniflora is attributed to the presence of high concentrations of the DMS precursor dimethylsulfoniopropionate (DMSP in the plant tissue). Enzymatic cleavage of this compound produces DMS plus acrylic acid. S. alterniflora is one of only three plant species containing DMSP, the others being S. anglica and S. foliosa. Spartina patens does not contain DMSP. In general, emissions to the atmosphere are lower than that reported for salt marshes. 

Spartina patens Typha latifolia, Salix nigm,... 

FIGURE 18.17 Schematic relationship between root growth of Spartina patens and sediment redox conditions. (Modified from Pezeshki and DeLaune, 1990.)... 

Spartina altemiflora (salt) Spartina patens (brackish) Panicum hemitomon (fresh)... 

Seasonal field sulfur emission measurements (DeLaune et al., 2002b) were determined in a Spar-tina alterniflora salt marsh (10-12 ppt salinity), a Spartina patens brackish marsh (5-8 ppt), and a Sagittaria lancifolia freshwater marsh (0 ppt salinity), along a salinity gradient extending inland from the coast in the Mississippi River deltaic plain region of the coastal Lonisiana. Results... 

TABLE 18.13b Spartina patens Louisiana Brackish Marsh ... 

Pezeshki, S. R. and R. D. DeLaune. 1990. Influence of sediment oxidation-reduction potential on root elongation in Spartina patens. Acta Oecol. 11 377-383. 

Pezeshki, S. R., R. D. DeLaune, and S. Z. Pan. 1991. Relationship of soil hydrogen sulfide level to net carbon assimilation of Panicum hemitomon and Spartina patens. Vegetation 95 159-166. 

The wetlands at this site are classified as brackish marshes, based on the presence of indicator plants (Penfound and Hathaway, 1938 O Neil, 1949 Wicker, 1980 Gosselink, 1984) and are mostly dominated by Spartina patens, with subordinate amounts of Eleocharis spp., Vigna lutea, Baopa monneiri. Aster tenufolius, and Scirpus olneyi (Guntenspergen et al, 1995). 

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